🏋️ 1 Rep Max Calculator

Estimate your one-rep max accurately — free tool for athletes

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💪 Estimated 1 Rep Max —
🏆 95% of 1RM (Strength) —
⚡ 90% of 1RM (Working sets) —
* Estimations are based on scientific formulas. Always use a spotter when testing max lifts.

Privacy Policy

We do not collect any personal data. This tool runs entirely in your browser. No cookies, no tracking. Google AdSense may serve ads based on your previous browsing behavior.

For any questions, contact us at support@strengthlab.com

Terms of Use

This calculator provides estimates only. Actual strength may vary. Always consult a professional before attempting heavy lifts. By using this tool, you agree that the owners are not liable for any injuries.

About Us

StrengthLab provides free, accurate fitness calculators for athletes worldwide. Our mission is to help you train smarter.